Superstructure for an artificial tooth

Abstract

A superstructure for an artificial tooth is formed of a a root post which is screwed into a root canal of a tooth stump. The root post includes a cylindrical tap having a cutting thread, and is capable of guiding a sleeve-shaped rose cutter having a curved cutting surface to produce a tooth recess with a lower curved portion. The tooth recess is concentric with respect to the root post. A sleeve-shaped crown anchor is concentrically secured to the root post and has a lower curved portion which fits into and corresponds with the lower curved portion of the recess. The artificial tooth is secured on the crown anchor.

I claim: 
     
       1. A superstructure for an artificial tooth, comprising: a root post for being screwed into a root canal of a tooth stump, said root post comprising a cylindrical tap having a cutting thread, said root post being capable of guiding a sleeve-shaped rose cutter having a curved cutting surface for producing a tooth recess having a lower curved portion and which is concentric with respect to said root post; and   a sleeve-shaped crown anchor concentrically secured to said root post and having a lower curved portion which fits into and corresponds with the lower curved portion of said recess, said artificial tooth being secured on said crown anchor.   
     
     
       2. The superstructure for an artificial tooth of claim 1, wherein at least the surfaces of said root post are made of titanium. 
     
     
       3. The superstructure for an artificial tooth of claim 1, wherein said crown anchor is made of a synthetic material, more particularly a fiber reinforced composite material. 
     
     
       4. The superstructure for an artificial tooth of claim 1, wherein said root post is elongated and includes a separating line for shortening said root post, said root post being adapted to be shortened to a length which is shorter than a height of said crown anchor after said root post is screwed into the root canal and after said tooth recess has been drilled. 
     
     
       5. The superstructure for an artificial tooth of claim 4, wherein said crown anchor is conformed such as to be shrunk onto said shortened root post. 
     
     
       6. The superstructure for an artificial tooth of claim 1, wherein a portion of said crown anchor projects above said tooth stump and said crown anchor is upwardly tapered. 
     
     
       7. The superstructure for an artificial tooth of claim 1, wherein said crown anchor has an external surface and connecting means disposed on said external surface for solidly connecting said artificial tooth on said crown anchor. 
     
     
       8. The superstructure for an artificial tooth of claim 7, wherein said connecting means comprises at least one rib disposed on said external surface. 
     
     
       9. The superstructure for an artificial tooth of claim 7, wherein said connecting means comprises at least one slot disposed on said external surface. 
     
     
       10. The superstructure for an artificial tooth of claim 7, further comprising a rose cutter for being guided along said root post for producing a tooth recess as aforesaid. 
     
     
       11. The superstructure for an artificial tooth of claim 1, wherein said root post has at least one groove extending axially along an external side. 
     
     
       12. A method for producing a superstructure for an artificial tooth comprising the steps of: screwing a root post into a root canal of a tooth stump;   guiding a sleeve-shaped rose cutter over said root post, said rose cutter having a curved cutting surface;   drilling a tooth recess with said rose cutter, said tooth recess being concentric with said root post and having a lower curved portion;   removing the rose cutter;   fitting a sleeve-shaped crown anchor over said root post and into said tooth recess, said crown anchor being concentric with said root post and having a lower curved portion which corresponds with said lower curved portion of said recess; and   securing said artificial tooth on said crown anchor.   
     
     
       13. The method of claim 12, wherein said root post is elongated and further comprising the step of shortening said root post to a length which is shorter than a height of said crown anchor, said root post including a separating line for shortening said root post, after said steps of screwing said root post into the root canal and drilling said tooth recess.